import {v4 as uuidv4} from 'uuid'
// 生成一个随机字符串，且每次执行不能发生变化，游客身份持久存储
export const getUUID = () => {
  // 先从本地存储获取uuid（看一下本地存储里面是否有）
  let uuid_token = localStorage.getItem ('UUIDTOKEN')
  if (!uuid_token) {
    uuid_token = uuidv4 ()
    localStorage.setItem ('UUIDTOKEN', uuid_token)
  }
  return uuid_token
}